Unicode C++

WebSocket Binance Trade Stream (subscribe and receive updates)

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Subscribe to a binance trade stream and receive updates. Unicode C++

#include <CkWebSocketW.h>
#include <CkRestW.h>
#include <CkJsonObjectW.h>

void ChilkatSample(void)
    {
    bool success = false;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkWebSocketW ws;

    // For brevity, this example does not check for errors when etablishing the WebSocket connection.
    // See Establish WebSocket Connection for more complete sample code for making the connection.

    CkRestW rest;

    // Connect to wss://stream.binance.com:9443
    success = rest.Connect(L"stream.binance.com",9443,true,false);
    if (success == false) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    success = ws.UseConnection(rest);
    if (success == false) {
        wprintf(L"%s\n",ws.lastErrorText());
        return;
    }

    ws.AddClientHeaders();

    //  Raw streams are accessed at /ws/<streamName>
    const wchar_t *responseBody = rest.fullRequestNoBody(L"GET",L"/ws/btcusdt");
    if (rest.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    success = ws.ValidateServerHandshake();
    if (success != true) {
        wprintf(L"%s\n",ws.lastErrorText());
        wprintf(L"%s\n",responseBody);
        wprintf(L"%s\n",rest.responseHeader());
        return;
    }

    wprintf(L"%s\n",responseBody);
    wprintf(L"%s\n",rest.responseHeader());

    // POST JSON to subscribe to a stream

    // {
    // "method": "SUBSCRIBE",
    // "params":
    // [
    // "btcusdt@aggTrade",
    // "btcusdt@depth"
    // ],
    // "id": 1
    // }

    CkJsonObjectW json;
    json.UpdateString(L"method",L"SUBSCRIBE");
    json.UpdateString(L"params[0]",L"btcusdt@aggTrade");
    json.UpdateString(L"params[1]",L"btcusdt@depth");
    json.UpdateInt(L"id",1);

    // Send a full message in a single frame
    bool finalFrame = true;
    success = ws.SendFrame(json.emit(),finalFrame);
    if (success != true) {
        wprintf(L"%s\n",ws.lastErrorText());
        return;
    }

    CkJsonObjectW jsonTradeData;
    jsonTradeData.put_EmitCompact(false);

    // Begin reading the trade stream response.
    // We'll just read the 1st 10 updates and then exit..
    bool receivedFinalFrame = false;
    int numTradesReceived = 0;
    while (numTradesReceived < 5) {

        success = ws.ReadFrame();
        if (success != true) {
            wprintf(L"Failed to receive a frame\n");
            wprintf(L"ReadFrame fail reason = %d\n",ws.get_ReadFrameFailReason());
            wprintf(L"%s\n",ws.lastErrorText());
            return;
        }

        // The responses we desire are in Text frames, where the opcode = 1.
        if (ws.get_FrameOpcodeInt() == 1) {
            const wchar_t *receivedJson = ws.getFrameData();

            jsonTradeData.Load(receivedJson);
            wprintf(L"%s\n",jsonTradeData.emit());

            numTradesReceived = numTradesReceived + 1;
        }

    }

    // Close the websocket connection.
    success = ws.SendClose(true,1000,L"Closing this websocket.");
    if (success != true) {
        wprintf(L"%s\n",ws.lastErrorText());
        return;
    }

    // Read the Close response.
    success = ws.ReadFrame();
    if (success != true) {
        wprintf(L"ReadFrame fail reason = %d\n",ws.get_ReadFrameFailReason());
        wprintf(L"%s\n",ws.lastErrorText());
        return;
    }

    wprintf(L"Success.\n");

    // The output of the above code is shown here:
    }